In May 2023, Steve and I planted our Greenwood Nursery quart size Phenomenal Lavender plants with the pint size Georgia Blue Veronicas just in front of them (bottom picture). As of last weekend, you can see how much all plants have grown (top picture).

We did nothing more than provide supplemental watering last summer during dry periods. No fertilize has been applied. We just added water and let them grow. 

Buying small plants is a good thing. They typically require less water and care than larger, older plants.